Solid Electrolytic Capacitor Containing An Adhesive Film
Active Publication Date: 2019-10-17
KYOCERA AVX COMPONENTS CORP
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Benefits of technology
This patent describes a new type of capacitor that has a solid electrolytic capacitor element with an interior conductive polymer layer, an adhesive film, and an exterior conductive polymer layer. The adhesive film is made up of a very thin layer with high conductivity. The method for making this new capacitor involves a sequential vapor deposition process with gaseous precursor compounds and an oxidizing agent. The resulting capacitor has improved performance compared to traditional capacitors.
Problems solved by technology
One of the problems with conventional capacitors that employ solution-polymerized conductive polymers is that they tend to fail at high voltages, such as experienced during a fast switch on or operational current spike.
While some benefits have been achieved with these capacitors in high voltage environments, problems nevertheless remain.
For instance, one problem with polymer slurry-based capacitors is that it is often difficult for the interior polymer layers, whether in situ polymerized or made from a polymer slurry, to penetrate and uniformly coat the pores of the anode.
Not only does this reduce the points of contact between the electrolyte and dielectric, but it can also cause delamination of the polymer from the dielectric during mounting or use.
As a result of these problems, it is often difficult to achieve ultralow ESR and / or leakage current values, particularly at relatively high voltages.
Method used
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[0012]It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended as limiting the broader aspects of the present invention, which broader aspects are embodied in the exemplary construction.
[0013]Generally speaking, the present invention is directed to a solid electrolytic capacitor that contains a capacitor element including a sintered porous anode body, a dielectric overlying the anode body, and a solid electrolyte overlying the dielectric. The solid electrolyte contains one or more interior conductive polymer layer(s) that overly the dielectric, an adhesive film that overlies the interior layer(s), and one or more exterior conductive polymer layers that overly the adhesive film. The adhesive film typically has a thickness of about 10 nanometers or more, in some embodiments from about 20 nanometers to about 1,000 nanometers, and in some embodiments, from about 30 nanometers to about 800 n...
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A capacitor comprising a solid electrolytic capacitor element that contains a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte is provided. The solid electrolyte contains an interior conductive polymer layer overlying the dielectric, an adhesive film that overlies the interior conductive polymer layer, which may be formed by sequential vapor deposition. An exterior conductive polymer layer also overlies the adhesive film.
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]The present application claims filing benefit of U.S. Provisional Patent Application Ser. No. 62 / 657,174 having a filing date of Apr. 13, 2018, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Solid electrolytic capacitors (e.g., tantalum capacitors) are typically made by pressing a metal powder (e.g., tantalum) around a metal lead wire, sintering the pressed part, anodizing the sintered anode, and thereafter applying a solid electrolyte. Intrinsically conductive polymers are often employed as the solid electrolyte due to their advantageous low equivalent series resistance (“ESR”) and “non-burning / non-ignition” failure mode. Such electrolytes can be formed through solution phase polymerization of a liquid monomer (e.g., 3,4-ethylenedioxythiopene, EDOT) in the presence of an oxidant (e.g., iron (III) toluene-sulphonate or iron (III) chloride) and a solvent (e.g., butanol). One of the problems with c...
Claims
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Login to View More IPC IPC(8): H01G9/052H01G9/00
CPCH01G9/052H01G2009/0014H01G9/0032H01G9/0036H01G9/028H01G9/07H01G9/15
InventorPETRZILEK, JANWEAVER, MITCHELL D.UHER, MILOSLAV
OwnerKYOCERA AVX COMPONENTS CORP